Namesakes
Fictional Characters from Television:
1 character
Gemma Whitely 1994 Heartbreak High 
Notable Actors and Entertainers:
4 actors, 1 actor/model
Gemma Craven 1950-
Gemma Whelan 1981-
Gemma Chan 1982-
Gemma Atkinson 1984-
Gemma Arterton 1986-
Olympic Medalists:
2 silver, 1 bronze
(silver) Gemma Mengual 2008 synchronized swimming - duet; synchronized swimming - team
(silver) Gemma Gibbons 2012 judo
(bronze) Gemma Beadsworth 2008; 2012 water polo
Saints:
1 blessed, 1 saint
Blessed Gemma of Sulmona 1364-1429
Saint Gemma Galgani 1878-1903